(19)
(11) EP 0 747 780 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.01.1997 Bulletin 1997/02

(43) Date of publication A2:
11.12.1996 Bulletin 1996/50

(21) Application number: 96304283.3

(22) Date of filing: 07.06.1996
(51) International Patent Classification (IPC)6: G03G 15/02
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 08.06.1995 JP 166924/95

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventors:
  • Okano, Keiji
    Tokyo (JP)
  • Inoue, Takahiro
    Tokyo (JP)
  • Sakurai, Kazushige
    Tokyo (JP)
  • Onimura, Tadashi
    Tokyo (JP)
  • Suwa, Kouichi
    Tokyo (JP)
  • Ojima, Masaki
    Tokyo (JP)
  • Sato, Hiroshi
    Tokyo (JP)
  • Yamaguchi, Seiji
    Tokyo (JP)
  • Matsumoto, Hideki
    Tokyo (JP)

(74) Representative: Beresford, Keith Denis Lewis et al
BERESFORD & Co. 2-5 Warwick Court High Holborn
London WC1R 5DJ
London WC1R 5DJ (GB)

   


(54) Image forming apparatus comprising contact type charging member


(57) An image forming apparatus includes a image bearing member comprising a photosensitive layer, a surface protection layer which comprises fluorine resin material; a charging member contactable to the image bearing member to electrically charge the image bearing member, the charging member is capable of beina supplied with an oscillation voltage, and wherein a peak-to-peak voltage of the oscillating voltage applied across a gap between a surface of the charging member and the surface of the image bearing member, is not less than twice a charge starting voltage of the image bearing member in the gap and not more than 1600 volt.






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